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A kind of screening method of power lithium ion battery

A lithium-ion battery and screening method technology, which is applied in the field of lithium-ion battery recycling and manufacturing, can solve problems such as prone to misjudgment

Active Publication Date: 2019-11-26
MEIZHOU LIANGNENG NEW ENERGY SCI & TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The traditional screening method is to select batteries with qualified initial capacity, high voltage, low internal resistance, and small storage self-discharge by testing the basic performance of the battery such as capacity, voltage, internal resistance, and storage self-discharge at room temperature. However, this method is prone to misjudgment, because it is impossible to simply rely on the initial values ​​of capacity, voltage, and internal resistance to judge whether the battery cycle performance meets the requirements, and whether the remaining life can meet the requirements of energy storage, daily digital, and household appliances. The normal use requirements of other industries

Method used

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  • A kind of screening method of power lithium ion battery
  • A kind of screening method of power lithium ion battery
  • A kind of screening method of power lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] Put each of the 100 single batteries at -10°C and 50°C respectively for 2 hours, so that the internal material system of the battery is completely in this temperature environment,

[0038] Then use an internal resistance tester (in this example, Lanqi BK-600) to test the internal resistance of the battery at different temperatures (-10°C and 50°C in this example) (the internal resistance test method is a routine in the art, and will not be described here. Let me repeat), calculate and count the difference of the internal resistance of each single battery under the environment of -10°C and 50°C (that is, the internal resistance difference). According to the statistical results, the internal resistance difference of the tested single battery is distributed between Between 2 and 15mΩ.

[0039] According to the distribution of internal resistance difference above, 8 batteries (B1~B8) were selected, and the capacity detection cabinet (Xinwei CT-3008W-5V3A was used in this ex...

Embodiment approach

[0057] The above-mentioned embodiment is the internal resistance tested in the -10°C and 50°C environments with a temperature difference of 60°C, and the difference is calculated. In other implementations, the two environments with a temperature difference greater than or equal to 30°C are applicable, such as The first temperature can be other values ​​in the range of -20 to 10°C, and the second temperature can be other values ​​in the range of 20 to 70°C. , the greater the difference in internal resistance, the worse the cycle performance of the battery) is also the same as the above-mentioned embodiment, and the single batteries screened therefrom all meet the requirements.

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Abstract

The invention provides a screening method of a power lithium ion battery. The screening method comprises the following steps that 1) after each of a plurality of single batteries detached from a recycled power lithium ion battery pack is stored for a preset time at a first temperature and a second temperature different from the first temperature, internal resistances of each single battery at the first temperature and at the second temperature are respectively tested, and internal resistance difference of each single battery at the two temperatures is calculated; and 2) the single battery with the internal resistance difference smaller than or equal to an internal resistance difference threshold value is screened out. The screening method is high in accuracy, not prone to misjudgment, and capable of realizing the cascade use of the lithium ion batteries which are replaced in the power industries of the electric automobile, the electric bicycle, the model airplane, the electrical tools and the like.

Description

technical field [0001] The invention relates to the field of recycling and manufacturing of lithium-ion batteries, in particular to a screening method for power lithium-ion batteries. Background technique [0002] With the continuous development of social economy, energy and environmental protection have become two major problems faced by all mankind. In recent years, the state has issued a series of incentive policies for the application of new energy vehicles. Domestic power lithium-ion batteries, especially power vehicles Batteries have seen rapid development. [0003] However, with the widespread application of power lithium-ion batteries, new environmental protection issues will arise. Normal power lithium-ion batteries have a lifespan of 3 to 5 years in automobiles. These large power lithium batteries cannot be used any longer. Afterwards, recycling is required. At present, the conventional recycling method is to disassemble the battery, separate the positive and neg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344H01M10/54H01M10/42
CPCB07C5/344H01M10/4207H01M10/54Y02E60/10Y02W30/84
Inventor 赵培成王守军
Owner MEIZHOU LIANGNENG NEW ENERGY SCI & TECHCO